The Brooklyn man who stabbed a mugger to death during a chance encounter on the street last month will not be charged, The Post has learned.

Devon Plummer, 33, said he was relieved he won’t face murder and weapons possession charges for stabbing to death Tony Hubbard, 30, on Belvidere Street at Broadway in Williamsburg about 12:30 p.m. on Oct. 30.

“But the whole incident – I just wish it never happened,” Plummer told The Post in his East Flatbush apartment.

After reviewing the evidence, the Brooklyn district attorney’s office concluded there wasn’t enough evidence to contradict Plummer’s claim he acted in self-defense.

Plummer, a father of six who works as a supervisor for Nanz Custom Hardware in Williamsburg, was on his lunch break when he was accosted by Hubbard.

Hubbard was back on the street after serving nearly nine years for another armed robbery.

According to Plummer’s account, Hubbard simulated a gun and grabbed his $700 gold chain from his neck, causing it to fall to the ground.

“Don’t make me clap you, man!” Hubbard allegedly told Plummer as he reached for the chain.

Plummer, recognizing the word “clap” as street slang for “shoot,” pulled out a knife and stabbed Hubbard in the chest and left shoulder, sources said.

Hubbard was declared dead at Woodhull Hospital.

Plummer, who has no record, admitted he had a folding knife that he disposed of after the attack, a source said.